CN102026362B - Method and device for adjusting figuration weighting coefficient - Google Patents

Abstract

The invention relates to the field of communication, and discloses a method and a device for adjusting figuration weighting coefficients, which are used to adjust the figuration weighting coefficients accurately based on the practical demands of user terminals so as to avoid increasing the loss in performance. The method is as follows: in conclusion, in the embodiment of the invention, a base station groups the user terminals according to TPC (transmit power control) command words sent by the user terminals, and respectively adjusts the figuration weighting coefficient of each group of user terminals correspondingly according to the comparison result of the current maximum transmission power and the transmission power of each group of user terminals, thereby ensuring that the adjustment on figuration weighting coefficients of each group of the user terminals is based on the practical adjustment demand of the user terminals, avoiding increasing the loss in performance of partial user terminals due to the uniform adjustment on transmitting powers of the user terminals, ensuring the service reliability of the system effectively, and promoting the system performance.

Description

A kind of method and device of adjusting figuration weighting coefficient

Technical field

The present invention relates to the communications field, particularly a kind of method and device of adjusting figuration weighting coefficient.

Background technology

At present, the wave beam forming technology is widely used in mobile communication system, adopts the array antenna of wave beam forming technology to be commonly referred to as smart antenna.Smart antenna passes through wave beam forming, main beam is aimed at desired user to be received and dispatched, thereby improve the receiving terminal power of desired user, simultaneously, smart antenna also can be according to the space characteristics of interference signal, weight coefficient adjustment by each antenna element falls into zero of array aerial direction figure in the aligning interference user, can reduce like this signal power from interference user; On the other hand, at cell edge, improved the received power of receiving terminal due to the wave beam forming technology, so the scope that the residential quarter covers has obtained expansion.

In general, the criterion of employing wave beam forming technology institute reference comprises maximum power criterion and max carrier to interference criterion etc., no matter and based on which kind of criterion, all correspondence is designed with the multiple method of obtaining the wave beam forming coefficient, wherein, the most frequently used is eigen beam figuration algorithm, adopts the weight coefficient that eigen beam figuration algorithm obtains so that the received power of receiving terminal is maximum, according to the concrete methods of realizing of algorithm, can obtain the optimal solution of the overall situation.

For example, suppose the smart antenna of N antenna element: the multi-antenna signal vector of reception is x=[x ₁, x ₂..., x _N], wave beam forming weight coefficient vector is w=[w ₁, w ₂..., w _N], the reception signal after figuration is:

$y=w^{T}x=\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{w}_n{x}_n$ (formula 1)

And the power that receives signal after figuration is:

P=|y| ²=y ^*Y=w ^Hx ^*x ^TW=w ^HR _xxW (formula 2)

Wherein, () ^*The conjugation of expression plural number (complex vector), () ^HThe conjugate transpose of expression vector (matrix), () ^TThe transposition of expression vector (matrix) is to seek a weight vector to make formula (2) reach maximum based on the target of maximum power criterion, determines that namely formula (3) gets maximum:

$w_{\mathrm{opt}1}=\underset{w}{\arg \max }\left(\frac{w^H{R}_{\mathrm{xx}}w}{w^{H}w}\right)$ (formula 3)

Wherein, w _Opt1To make

Get peaked w, by the matrix correlation characteristic as can be known, order

Getting peaked w, is also to make formula (2) reach peaked w simultaneously, is namely matrix R _xxEigenvalue of maximum characteristic of correspondence vector.

Said method is namely eigen beam figuration algorithm.Adopt the advantage of eigen beam figuration algorithm to be, be issued in fixing transmitting power prerequisite and realize optimal solution, namely in the situation of given total transmitting power, adopt eigen beam figuration algorithm, can by the distribution of transmitting power on each antenna and the adjustment of phase place, make the received power of terminal maximum; And adopt the shortcoming of eigen beam figuration algorithm to be, the transmitting power of distributing on each antenna element is not wait, in actual applications, the maximum transmission power of antenna element is fixed, if enter transmitting power over its emission maximum ability to antenna feed, antenna (comprising the radio-frequency channel) will be operated in the inelastic region, thereby affect the entire system performance.

For the problems referred to above, existing solution is: the antenna to the transmitting power maximum carries out Power Limitation, then the amplitude of forming coefficient is adjusted, thereby reaches the condition that satisfies power limited.Yet in the communication environment of reality, antenna array often can send a plurality of users' data at synchronization, the environment difference that different user is actual according to it, required transmitting power is also different, at a time, part user may require to strengthen transmitted power, another part user low transmitting power of begging to surrender possibly, therefore, if Power Limitation is carried out in unification, can make for all users' transmitting power and all lowering, like this, can be to requiring the user who increases transmitting power to cause larger performance loss, thus have a strong impact on the system business performance.

Summary of the invention

The embodiment of the present invention provides a kind of method and device of adjusting figuration weighting coefficient, in order to the actual demand based on user terminal, carries out the accurate adjustment of figuration weighting coefficient, avoids increasing performance loss.

The concrete technical scheme that the embodiment of the present invention provides is as follows:

A kind of method of adjusting figuration weighting coefficient comprises:

Determine to have the antenna of current maximum transmission power;

The maximum transmission power that described current maximum transmission power and described antenna can be carried compares, when determining maximum transmission power that described current maximum transmission power can carry greater than described antenna, according to the TPC command word that each user terminal sends, each user terminal is divided into lowers user's group and raise user's group;

Calculate the first transmitting power of organizing for described downward user on described antenna, and for described the second transmitting power that raises user's group;

With described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

A kind of device of adjusting figuration weighting coefficient comprises:

The first processing unit, be used for determining to have the antenna of current maximum transmission power, the maximum transmission power that described current maximum transmission power and described antenna can be carried compares, when determining maximum transmission power that described current maximum transmission power can carry greater than described antenna, notify described division unit that each user terminal is divided into groups;

Division unit is used for the TPC command word according to each user terminal transmission, each user terminal is divided into lowers user's group and raise user's group;

The second processing unit is used for calculating the first transmitting power of organizing for described downward user on described antenna, and for described the second transmitting power that raises user's group;

Adjustment unit, be used for described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

in the embodiment of the present invention, the TPC command word that the base station sends according to user terminal, user terminal is divided into groups, and organize the comparative result of the transmitting power of user terminal according to current maximum transmission power and each, respectively the figuration weighting coefficient of each group user terminal adjusted accordingly, thereby guaranteed the adjustment of the figuration weighting coefficient of each group user terminal, be based on all that the actual adjustment demand of user terminal carries out, avoided the transmitting power of user terminal is unified to adjust, and appearance increases the situation of certain customers' terminal capabilities loss, effectively guaranteed the service reliability of system, promoted systematic function.

Description of drawings

Fig. 1 is mobile communication system architectural framework figure in the embodiment of the present invention;

Fig. 2 is base station functions structural representation in the embodiment of the present invention;

Fig. 3 is that in the embodiment of the present invention, network side apparatus carries out the wave beam forming flow chart.

Embodiment

when adopting eigen beam figuration algorithm, if there is the limited situation of certain transmitting antenna power, the base station is by each user's of obtaining TPC(Transmission Power Control, through-put power is controlled) command word, come definite amplitude that the wave beam forming coefficient of user terminal is adjusted, be specially: the antenna of determining to have current maximum transmission power, TPC command word according to each user terminal transmission, each user terminal is divided into lowers user's group and raise user's group, calculate again on above-mentioned antenna for the first transmitting power of lowering user's group, with the second transmitting power for rise user group, at last, again with the first transmitting power and the second transmitting power, the maximum transmission power that can carry with antenna compares, and according to comparative result, respectively to lowering user's group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.

Consult illustrated in figures 1 and 2ly, in the embodiment of the present invention, comprise some base stations and user terminal in mobile communication system, wherein, the base station comprises the first processing unit 20, division unit 21, the second processing unit 22 and adjustment unit 23, wherein,

The first processing unit 20 is for the antenna of determining to have current maximum transmission power;

Division unit 21 is used for the TPC command word according to each user terminal transmission, each user terminal is divided into lowers user's group and raise user's group;

The second processing unit 22 is used for calculating the first transmitting power of organizing for the downward user on above-mentioned antenna, and for the second transmitting power that raises user's group;

Adjustment unit 23, be used for the first transmitting power and the second transmitting power, the maximum transmission power that can carry with antenna compares, and according to comparative result, respectively to lowering user's group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

Based on technique scheme, to consult shown in Figure 3ly, in the embodiment of the present invention, it is as follows that the detailed process of wave beam forming is carried out in the base station:

Step 300: control the TPC command word according to the through-put power that each user terminal sends, each user terminal is divided into lowers user's group and raise user's group.

In the embodiment of the present invention, suppose that the base station synchronization need to be to K user terminal to transmit data, the forming coefficient of this K user terminal is respectively W _i=[W _i1, W _i2..., W _iKa] ^H, wherein, i=1,2 ... K, Ka represent the antenna number of aerial array.

Suppose in K user, K1 the TCP command word indication downward transmitting power that user terminal sends, transmitting power is raised in the TCP command word indication of K2 user's transmission, K=K1+K2, so, K1 user terminal is divided into lowers user's group, K2 user terminal is divided into raises user's group.

Step 310: calculate respectively the current transmitting power of each root antenna, and determine to have the antenna of current maximum transmission power; In the present embodiment, the numbering of this antenna is designated as Ka_max.

In the embodiment of the present invention, adopt formula

Calculate the current transmitting power of each root antenna, wherein, W _iKaBe the current wave beam forming weight coefficient of iKa root antenna, Ka is the antenna number of aerial array, and K represents to exist K user terminal.

Step 320: determine the maximum transmission power that antenna can carry, be designated as P _max

In practical application, on same base station, the maximum transmission power of each antenna is normally consistent, is determined by antenna performance.

Step 330: will calculate the current maximum transmission power that obtains and the maximum transmission power that antenna can carry and compare, and judge P _{Ka_max}≤ P _maxIf, do not do any power adjustment, finish current flow process; Otherwise, execution in step 340.

Step 340: calculate P _{Ka_max}Upper transmitting power P for downlink user group (being K1 user terminal) _K1, and for the transmitting power P that raises user's group (being K2 user terminal) _K2

Above-mentioned P _K1Can regard that namely K1 user is at P as _{Ka_max}In contribution degree,

P _K2Can be regarded as K2 user at P _{Ka_max}In contribution degree,

Step 350: with P _K1And P _K2With P _maxCompare, and according to comparative result, to lowering user's group or/and raise the figuration weighting coefficient of each user terminal in user's group and adjust accordingly.

During execution in step 350, P can be set _K1And P _K2The comparative optimization level, better, P is set _K1The comparative optimization level higher than P _K2The comparative optimization level, like this, can preferentially according to comparative result carry out for the power of lowering user's group and adjust strategy, be conducive to save the operating time of overall flow.

In the embodiment of the present invention, the concrete mode during execution in step 350 is as follows:

In the first situation, if P _K1, P _K2All greater than P _max, respectively K1 user terminal and K2 figuration weighting coefficient corresponding to user terminal be multiply by

In the second situation, if P only _K1Greater than P _max, respectively K1 figuration weighting coefficient corresponding to user terminal be multiply by

In the third situation, if P only _K2Greater than P _max, respectively K2 figuration weighting coefficient corresponding to user terminal be multiply by

In the 4th kind of situation, if P _K1Less than P _max, P _K2Less than P _max, and P _maxLess than P _K1+ P _K2, can be respectively to K1 user terminal or/and K2 figuration weighting coefficient corresponding to user terminal adjusts accordingly, specifically adjust mode and can choose one wantonly in following four kinds of mode:

(i) respectively K1 figuration weighting coefficient corresponding to user terminal be multiply by

(ii) respectively K2 figuration weighting coefficient corresponding to user terminal be multiply by

(iii) respectively K1 user terminal and K2 figuration weighting coefficient corresponding to user terminal be multiply by $\sqrt{\frac{P_{\max }}{P_{K1}+P_{K2}}};$

(iii) respectively K1 figuration weighting coefficient corresponding to user terminal be multiply by x_K1, respectively K2 figuration weighting coefficient corresponding to user terminal be multiply by x_K2 simultaneously, wherein, x_K1 and x_K2 are obtained by following linear equation in two unknowns group:

P _K1*x_K1+P _K2*x_K2＝P _max

$\frac{x\_K1}{x\_K2}=\frac{P_{K1}}{P_{K2}}$

After execution of step 350, beam form-endowing method just can be adopted according to the figuration weighting coefficient of each user terminal after adjusting in the base station, calculates the transmitting power of each user terminal,

The embodiment of the present invention provides a kind of method and device of adjusting figuration weighting coefficient, in order to the actual demand based on user terminal, carries out the accurate adjustment of figuration weighting coefficient.

Based on above-described embodiment, when execution in step 350, to lowering user's group or raising the user when organizing one of them corresponding figuration weighting coefficient and adjusting, too much cause the integral body of systematic function to descend for fear of adjusting range when only, better, should arrange one and adjust threshold T _h, only have as Δ＞T _hJust carry out corresponding adjusting operation, the more users terminal is received as adjusting object avoiding, wherein, Δ=P _max-P _K1Or Δ=P _max-P _K2

Based on above-mentioned criterion, in the 4th kind of situation in step 350, if just being adjusted, K1 figuration weighting coefficient corresponding to user terminal can satisfy T _h, so, in the TPC command word, lower the processing priority of user's group higher than raising user's group, at this moment, can select only to adjust K1 figuration weighting coefficient corresponding to user's difference and get final product, thereby avoid K2 the user terminal that TPC command word indicating raises impacted.

in sum, in the embodiment of the present invention, the TPC command word that the base station sends according to user terminal, user terminal is divided into groups, and organize the comparative result of the transmitting power of user terminal according to current maximum transmission power and each, respectively the figuration weighting coefficient of each group user terminal adjusted accordingly, thereby guaranteed the adjustment of the figuration weighting coefficient of each group user terminal, be based on all that the actual adjustment demand of user terminal carries out, avoided the transmitting power of user terminal is unified to adjust, and appearance increases the situation of certain customers' terminal capabilities loss, effectively guaranteed the service reliability of system, promoted systematic function.

Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (10)

1. a method of adjusting figuration weighting coefficient, is characterized in that, comprising:

Determine to have the antenna of current maximum transmission power;

The maximum transmission power that described current maximum transmission power and described antenna can be carried compares, when determining maximum transmission power that described current maximum transmission power can carry greater than described antenna, control the TPC command word according to the through-put power that each user terminal sends, each user terminal is divided into lowers user's group and raise user's group;

Calculate the first transmitting power of organizing for described downward user on described antenna, and for described the second transmitting power that raises user's group;

With described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

2. the method for claim 1, is characterized in that, first carry out for the compare operation of the first transmitting power and adjust accordingly strategy, then the compare operation of carrying out for the second transmitting power reaches corresponding adjustment strategy.

3. the method for claim 1, it is characterized in that, with described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly, comprising:

If P _K1, P _K2All greater than P _Max, will lower user group and raise that in user's group, figuration weighting coefficient corresponding to each user terminal multiply by respectively

Wherein, P _K1Be the first transmitting power, P _K2Be the second transmitting power, P _maxThe maximum transmission power that can carry for antenna;

If P only _K1Greater than P _max, will lower respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by $\sqrt{\frac{P_{\max }-P_{K2}}{P_{K1}}};$

If P only _K2Greater than P _max, will raise respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by $\sqrt{\frac{P_{\max }-P_{K1}}{P_{K2}}}.$

4. the method for claim 1, it is characterized in that, with described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly, comprising:

If P _K1Less than P _max, P _K2Less than P _max, and P _maxLess than P _K1+ P _K2, wherein, P _K1Be the first transmitting power, P _K2Be the second transmitting power, P _maxBe the maximum transmission power that antenna can carry, carry out following any one operation:

In user's group, figuration weighting coefficient corresponding to each user terminal multiply by to lowering respectively

To raise respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by

To lower respectively user group and raise that in user's group, figuration weighting coefficient corresponding to each user terminal multiply by $\sqrt{\frac{P_{\max }}{P_{K1}+P_{K2}}};$

To lower respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by x_K1, will raise respectively simultaneously the user organize in figuration weighting coefficient corresponding to each user terminal multiply by x_K2, wherein, x_K1 and x_K2 are obtained by following linear equation in two unknowns group:

P _K1*x_K1+P _K2*x_K2＝P _max

$\frac{x\_K1}{x\_K2}=\frac{P_{K1}}{P_{K2}}.$

5. method as described in claim 3 or 4, is characterized in that, if only figuration weighting coefficient corresponding to user terminal of lowering in user's group adjusted, at definite described P _maxWith P _K1Difference during greater than predetermined threshold value, then adjust accordingly;

If only figuration weighting coefficient corresponding to user terminal that raises in user's group adjusted, at definite described P _maxWith P _K2Difference during greater than predetermined threshold value, then adjust accordingly.

6. a device of adjusting figuration weighting coefficient, is characterized in that, comprising:

The first processing unit, be used for determining to have the antenna of current maximum transmission power, the maximum transmission power that described current maximum transmission power and described antenna can be carried compares, when determining maximum transmission power that described current maximum transmission power can carry greater than described antenna, notify described division unit that each user terminal is divided into groups;

Division unit, the through-put power that is used for sending according to each user terminal is controlled the TPC command word, each user terminal is divided into lowers user's group and raise user's group;

The second processing unit is used for calculating the first transmitting power of organizing for described downward user on described antenna, and for described the second transmitting power that raises user's group;

Adjustment unit, be used for described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly.

7. method as claimed in claim 6, is characterized in that, described adjustment unit is first carried out for the compare operation of the first transmitting power and adjusted accordingly strategy, then carry out compare operation and corresponding adjustment strategy for the second transmitting power.

8. device as claimed in claim 6, it is characterized in that, described adjustment unit is with described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly, comprising:

If P _K1, P _K2All greater than P _Max, will lower respectively user group and raise that in user's group, figuration weighting coefficient corresponding to each user terminal multiply by Wherein, P _K1Be the first transmitting power, P _K2Be the second transmitting power, P _maxThe maximum transmission power that can carry for antenna;

If P only _K1Greater than P _max, respectively K1 figuration weighting coefficient corresponding to user terminal be multiply by $\sqrt{\frac{P_{\max }-P_{K2}}{P_{K1}}};$

If P only _K2Greater than P _max, respectively K2 figuration weighting coefficient corresponding to user terminal be multiply by $\sqrt{\frac{P_{\max }-P_{K1}}{P_{K2}}}.$

9. device as claimed in claim 6, it is characterized in that, described adjustment unit is with described the first transmitting power and described the second transmitting power, the maximum transmission power that can carry with described antenna compares, and according to comparative result, respectively to described downward user group or/and raise that in user's group, figuration weighting coefficient corresponding to each user terminal adjusts accordingly, comprising:

If P _K1Less than P _max, P _K2Less than P _max, and P _maxLess than P _K1+ P _K2, wherein, P _K1Be the first transmitting power, P _K2Be the second transmitting power, P _maxBe the maximum transmission power that antenna can carry, carry out following any one operation:

In user's group, figuration weighting coefficient corresponding to each user terminal multiply by to lowering respectively

To raise respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by

To lower respectively user group and raise that in user's group, figuration weighting coefficient corresponding to each user terminal multiply by $\sqrt{\frac{P_{\max }}{P_{K1}+P_{K2}}};$

To lower respectively that in user group, figuration weighting coefficient corresponding to each user terminal multiply by x_K1, will raise respectively simultaneously the user organize in figuration weighting coefficient corresponding to each user terminal multiply by x_K2, wherein, x_K1 and x_K2 are obtained by following linear equation in two unknowns group:

P _K1*x_K1+P _K2*x_K2＝P _max

$\frac{x\_K1}{x\_K2}=\frac{P_{K1}}{P_{K2}}.$

10. install as claimed in claim 8 or 9, it is characterized in that, if only figuration weighting coefficient corresponding to user terminal of lowering in user's group adjusted, described adjustment unit is at definite described P _maxWith P _K1Difference during greater than predetermined threshold value, then adjust accordingly;

If only figuration weighting coefficient corresponding to user terminal that raises in user's group adjusted, described adjustment unit is at definite described P _maxWith P _K2Difference during greater than predetermined threshold value, then adjust accordingly.

Images